Astera Labs Inc.
Fabric Modeling and Analysis Engineer for Scale Up Fabric (2026-325)
San Jose, California, United States
Sponsorship not specifiedDetected 6 hours ago
Machine LearningCommunication
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Cap-exempt (no lottery)0
Sponsors this role90
Entry-level history0
PERM / green-card track0
Lottery odds40
Fits your clock70
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About the role
- Astera Labs is powering the connectivity behind rack-scale AI, and our Scorpio Scale-Up Fabric is central to how tomorrow's GPU clusters scale.
- This is a high-impact role for an engineer who thrives where architecture, performance analysis, and software converge.
- Your models will shape the next generate products and enable informed architectural decisions ahead of tape-out, surface bottlenecks that only appear at scale, and translate directly into roadmap and IP decisions.
Responsibilities
- Design, implement, and maintain features in AI/ML system simulators and fabric models, extending support for collective communication, transport, topology, congestion, routing, buffering, scheduling, and traffic management
- Improve simulator fidelity, scalability, debuggability, and runtime performance across packet-level, flow-level, and analytical backends, and build reusable abstractions and APIs for end-to-end simulation flows
- Continuously calibrate and validate models against benchmark data from the Performance Engineering team, owning the correlation between model predictions and measured silicon across scale up fabric generations
- Design and implement transaction-level or cycle-approximate system models of the Scale up fabric, enabling rigorous evaluation of new architectural ideas early in the design cycle, well before tape-out
- Develop and own theoretical roofline and analytical models that establish bandwidth, latency, and throughput ceilings for the Scale-Up fabric, mapping AI/ML workload demands against fabric capabilities to identify compute-bound vs. fabric-bound regimes
- Build analytical models of competing fabric architectures and evaluate emerging interconnect technologies - such as UALink, ESUN, and optical fabrics
Skills
- Simulation Infrastructure & Model Correlation
- Analytical & Fabric Performance Modeling
- Workload Characterization, Scalability & Topology Analysis
- Innovation, Competitive Analysis & Roadmap Influence
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